Limits of Bessel functions for root systems as the rank tends to infinity

• Published in: Indagationes mathematicae
• Main Authors: Brennecken, Dominik, Rösler, Margit
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2024
• Subjects: Asymptotic harmonic analysis; Bessel functions; Dunkl theory; Asymptotic harmonic analysis; Bessel functions; Dunkl theory
• ISSN: 0019-3577; 1872-6100
• DOI: 10.1016/j.indag.2024.05.004

We study the asymptotic behaviour of Bessel functions associated to root systems of type An−1 and type Bn with positive multiplicities as the rank n tends to infinity. In both cases, we characterize the possible limit functions and the Vershik–Kerov type sequences of spectral parameters for which such limits exist. In the type A case, this gives a new and very natural approach to recent results by Assiotis and Najnudel in the context of β-ensembles in random matrix theory. These results generalize known facts about the approximation of the positive-definite Olshanski spherical functions of the space of infinite-dimensional Hermitian matrices over F=R,ℂ,H (with the action of the associated infinite unitary group) by spherical functions of finite-dimensional spaces of Hermitian matrices. In the type B case, our results include asymptotic results for the spherical functions associated with the Cartan motion groups of non-compact Grassmannians as the rank goes to infinity, and a classification of the Olshanski spherical functions of the associated inductive limits.